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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '826ae63bb0f53d717884276289330cc0bed1363213805b2b1496ffbe22f56ea2' 
  AND token = '0F0YqLDLXqIkUtDK62h+mJXAxIdz86/+a8sIkp+O0qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}